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Exacto爱山吐牌手表exactadj.精密严谨的；确切的Exact analytical solution严格解析解exact cohomology sequence正合上同调序列Exact asymptotic behaviour渐近行为Exact null controllability精确零能控exact chemical thermometer[医] 精密化学温度计(内用氮填充)exact DA -optimal design精确DA-最优设计exact sequence of homology下同调正合序列exact in keeping a promise严守诺言exact timing of operations工时标定exact data synchronization数据精确同步